EASY
9th CBSE
IMPORTANT
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The elements present in sodium bicarbonate are sodium, carbon, and oxygen. (hydrogen/ boron)

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Important Questions on Atoms and Molecules

MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 5
Which one has more mass 1 mole of hydrogen gas or 0.20 mole of nitrogen gas?
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 6
Which one has the larger number of molecules- 1 mole of N2 or 1 mole of O2?
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 7
What is the value of Avogadro constant?(A: 6.022 × 1026, B: 6.022 × 1023 or  C: 6.022 × 1014.)

(Enter your correct answer as A, B or C)

EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 8
What is the valency of carbon in (a) CCl4, and (b) CO2?
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 9
If the atomic symbol of cobalt is Co, what is the atomic symbol of copper?
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 10
What is the number of moles in 18 g of water? (0.5 mole / 1 mole /1.5 mole)
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 11
What is the mass of 1 mole of water?
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Questions as per the Guidelines of CBSE>Q 1
State the law of constant proportions and name the scientist who proposed this law.